help with a program in tkinter

Question

I am making a counter program in which every time I touch the "+" button it has to increase the number that is displayed after the "counter:" label, but I can only make it increase from 0 to 1 and it does not increase anything else. I am new to graphical interfaces.
My code:
from tkinter import *
def sumar():
resultado.set(numero+1)
root=Tk()
root.title("Contador")
numero=0
resultado=IntVar()
Label(root,text="Contador:").grid(row=0,column=0)
Entry(root,justify=CENTER,state="disable",textvariable=resultado).grid(row=0,column=1)
Button(root,text="+",command=sumar).grid(row=0,column=2)
root.mainloop()

Answer 1

Because you are not incrementing Numero variable
Numero + 1 will always be 1
Because Numero variable has 0 in it

Answer 2

Ohhhh i see

Answer 3

Thank you very much